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AfterHow Much Does ADU Construction Cost in West Palm Beach?
An accessory dwelling unit in West Palm Beach typically costs between $90,000 and $220,000 to build, with most detached units landing between $150,000 and $190,000 when finished to code with a kitchen, full bathroom, and separate entrance. The final price depends on whether you build a detached unit in the backyard, convert an existing garage, or add a second story above a garage. A written price before any work starts is standard on every Elmstead Remodeling West Palm Beach project, so you will know your number before a single tool comes off the truck.
If you are weighing an ADU against a larger home addition, this guide walks through the actual line items, the West Palm Beach factors that push costs up or down, and the questions families ask us most before signing. For a deeper look at the building process itself, see our ADU Construction in West Palm Beach page.
ADU Construction Cost Breakdown (2026)
Here is what a detached ADU in West Palm Beach actually costs when you break it into pieces. These ranges reflect the local 2026 market, including Palm Beach County permit fees, hurricane-rated materials, and current labor rates.
| Line Item | Typical Range | Notes |
|---|---|---|
| Site work and foundation | $12,000 – $28,000 | Includes clearing, grading, slab or stem-wall foundation, and termite pre-treatment required by Florida code. |
| Framing and structural shell | $20,000 – $45,000 | Hurricane tie-downs, impact-rated sheathing, and roof structure built to Miami-Dade standards. |
| Plumbing rough-in and fixtures | $9,000 – $22,000 | New sewer lateral or tie-in to existing line, water supply, water heater, and a full bathroom fixture set. |
| Electrical rough-in and panel | $7,000 – $18,000 | Subpanel, wiring, lighting, and dedicated circuits. A service upgrade on the main house adds $2,500 – $6,000. |
| HVAC | $5,000 – $12,000 | Ductless mini-split is the most common choice; a small central system costs more. |
| Drywall, insulation, and paint | $9,000 – $18,000 | Spray foam insulation now required in many West Palm Beach permits, which costs more than batt but performs better in humidity. |
| Kitchen | $10,000 – $24,000 | Compact kitchen with cabinets, countertop, sink, and a small refrigerator and range. Cabinet lines like KraftMaid and Wellborn carry manufacturer warranties. |
| Bathroom | $8,000 – $18,000 | Full bath with shower, toilet, and vanity. Fixtures from Kohler, Moen, or Grohe. |
| Flooring | $3,500 – $9,000 | Luxury vinyl plank or tile throughout. Tile runs higher but handles moisture best. |
| Doors and windows | $4,000 – $10,000 | Impact-rated windows are required for new construction in West Palm Beach. Exterior door must meet wind-load code. |
| Permits and fees | $4,000 – $12,000 | Palm Beach County building permit, impact fees, and school district fees. West Palm Beach charges more for detached units than conversions. |
| Contractor overhead and management | $15,000 – $35,000 | Project management, scheduling, site protection, and the general contractor’s fee. |
Those numbers add up to the $90,000 to $220,000 total range, but the spread is driven by size, site conditions, and finish level. A 400-square-foot garage conversion with a compact kitchen and one bath lands at the lower end. An 800-square-foot detached cottage with upgraded finishes, impact glass, and a paver patio lands near the top.
What Drives ADU Costs in West Palm Beach Specifically
West Palm Beach is not a cheap place to build, and the reasons are specific. The city and Palm Beach County enforce wind-load requirements that add real money to framing and windows. Impact-rated windows are not optional on new detached structures. The water table in neighborhoods like Flamingo Park, El Cid, and south of Southern Boulevard can require deeper footings or additional soil compaction, which adds foundation cost before any walls go up. Permit fees in the city run higher than unincorporated county parcels, and school impact fees apply to any unit with a bedroom, which is essentially every ADU intended for family or rental use.
What Affects ADU Construction Pricing in West Palm Beach
When we walk a property in West Palm Beach and prepare a written price, here is what we look at before we put a number on paper.
- Detached versus attached or garage conversion. A detached ADU costs the most because it needs its own foundation, roof, four exterior walls, and independent utility runs. Converting an attached garage costs $30,000 to $80,000 because the structure already exists and is already tied to the house. Adding a second story above a garage runs somewhere between the two.
- Lot conditions and access. A narrow lot in Grandview Heights or a backyard with no alley access in Vedado means materials get hand-carried, which adds labor hours. Large oak roots, low overhead wires, and tight setbacks all push cost up. No guesswork here. It is simply more time for the crew.
- Utility connections. If the existing sewer line can accept the new bathroom, that saves thousands. If we have to run a new lateral to the street, or the electrical panel on the main house needs an upgrade from 100 to 200 amps, those are line items you will see in the written price before you sign.
- Interior finish level. A compact kitchen with stock cabinetry costs less than a unit with KraftMaid or Wellborn cabinets, a Cambria or Silestone countertop, and Grohe fixtures. We price both ways and let the family choose. You are never locked into a package you did not ask for.
- Permit complexity. ADUs in historic districts like El Cid, Old Northwood, and Flamingo Park may require additional design-review approvals, which add time and fee cost. A standard lot on a 1950s street in Southland Park tends to move through permitting faster.
- Finish date and season. Florida does not have a true construction off-season, but late summer and early fall see slower permitting and higher demand for crews. If flexibility on start date matters less to you than budget, that conversation is worth having with Graham and the team.
How to Save on ADU Construction in West Palm Beach
Most families we work with are not looking for the lowest bid. They are looking for a price they can trust and a crew that leaves the house the way they found it. That said, there are real ways to keep an ADU project reasonable without cutting corners on the things that protect the structure.
- Convert the garage before building detached. A garage conversion in West Palm Beach runs $30,000 to $80,000, which is often half or less of a detached unit. The roof, slab, and three walls are already there. You give up garage storage, but many families add a carport or shed later.
- Keep the footprint compact. A 500-square-foot ADU with a well-planned layout costs significantly less than an 800-square-foot unit and still fits a bedroom, full bath, kitchen, and living nook. The cost difference is not linear. Every added square foot brings more framing, more roofing, more drywall, and more flooring.
- Choose a single-level, simple roof line. Every dormer, bump-out, and gable adds framing labor and roof complexity. A simple rectangular footprint with a shed or gable roof is faster to frame, easier to flash, and cheaper to permit.
- Plan the kitchen and bath wall by wall at the same time. Back-to-back or stacked plumbing walls cut pipe runs and labor. A bathroom and kitchen that share a wet wall can save thousands in plumbing alone.
- Ask about material lead times early. Cabinets from KraftMaid and Wellborn are built to order. Ordering them the week framing ends means the crew waits. Ordering them at permit approval means they arrive when the drywall is finished. We sequence this on every project, but it matters more when a family is trying to hit a specific walk-in date.
Every Elmstead Remodeling West Palm Beach estimate is free, and the price we write down is the price you pay. If you want to see what these choices do to the number, call (728) 203-3270 and Graham will walk you through it on the phone or at the property.
FAQs – ADU Construction Cost
How much does a one-bedroom ADU cost in West Palm Beach?
A one-bedroom ADU in West Palm Beach typically runs $90,000 to $160,000 depending on whether it is a garage conversion or a detached build. A converted garage with a compact kitchen, full bath, and one bedroom lands at the lower end because the shell already exists. A detached unit with its own foundation, impact windows, and a separate utility connection lands at $140,000 to $160,000. Call (728) 203-3270 for a written price on your specific lot, free.
Is it cheaper to build an ADU or convert a garage in West Palm Beach?
Garage conversion costs $30,000 to $80,000, while a detached ADU runs $90,000 to $220,000, so conversion is usually the more economical choice. The catch is that you lose the garage, and some East-West Palm Beach lots have parking requirements that make a conversion more complicated than a backyard build. We will tell you which one makes sense on your lot before you commit to anything.
How long does ADU construction take in West Palm Beach?
Most ADUs in West Palm Beach take 6 to 12 months from permit submission to final inspection. Permitting with the city and Palm Beach County accounts for 6 to 12 weeks of that timeline in most cases. The build itself, once the slab is poured, moves faster. We sequence materials and inspections so the crew is never waiting on a delivery or a code review.
What permits are required for an ADU in West Palm Beach?
A detached ADU requires a building permit, electrical permit, plumbing permit, mechanical permit, and a zoning review through the City of West Palm Beach. Impact fees apply per dwelling unit and per bedroom, which adds several thousand dollars to the total. Our project scope includes permit fees as a line item, so the written price covers them from day one.
Do I need impact windows on an ADU in West Palm Beach?
Yes, new detached ADUs in West Palm Beach require impact-rated windows and doors that meet current Florida Building Code wind-load standards. This is not something to skip or substitute. The cost is built into the line item for doors and windows, so you will see the exact number before we start.
Can an ADU be rented out in West Palm Beach?
In most residential zones, a permitted ADU can be rented as a long-term dwelling, but short-term rentals like Airbnb are restricted in many parts of West Palm Beach. The city has specific rules about owner occupancy and rental duration that vary by zoning district. Ask during your estimate, and we will point you to the current municipal code section so you can verify it directly.
Why the Written Price Matters Before Any Work Starts
An ADU is a six-figure project, and the families we build for deserve to know the number before the first piece of lumber shows up. That is why every Elmstead Remodeling West Palm Beach project starts with a written price. Not a rough estimate that grows after demo. A written price, itemized, in your hands, before you sign anything.
The Cedarwell Care Promise we work under includes things families with children and pets notice immediately. Shoe covers and drop cloths go down before the crew walks inside. Quiet tools come out during nap and school hours where possible. We ask before moving anything, and we take a photo of the clean-up before the crew leaves. Pet-safe products are chosen where there is a real alternative.
And the 365-Day Done Right Promise stays with you after the final walkthrough. If something is not done right within the first year, we make it right. That is stamped on every project, not offered as an add-on.
Get a Free, Written ADU Estimate in West Palm Beach
If you are ready to see what an ADU costs on your specific lot in West Palm Beach, call (728) 203-3270. A live person answers, 24/7. No voicemail, no bot, no waiting until Monday. Graham Stein and the team will schedule a walkthrough, look at the lot conditions, the utility access, and the zoning, and hand you a written price with named materials and line items you can verify.
You have probably noticed that most contractors will not put a number in writing this early. We will. That is the whole point.
Pricing reflects the West Palm Beach market as of 2026. Elmstead Remodeling West Palm Beach offers free estimates – call (728) 203-3270.
Written by Graham Stein, Owner at Elmstead Remodeling West Palm Beach, building accessory dwelling units in West Palm Beach since 2005.
What Our Customers Say
"Opened up our kitchen. They controlled the dust better than I thought possible, protected the floors, and left a photo of the cleaned space each day. Gentle on the house and on budget."
- Simon Albright"Whole home refresh. The crew treated our belongings carefully, boxed and protected things, and swept nightly. Considerate of our schedule and quiet when we needed it. No mess left behind."
- Mauricio Peña"Main bath gut and redo. They protected the carpet the whole way down the hall and vacuumed daily. Quiet during naps when they could be. Lovely finish."
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